Th reason is fine but how if the real owner lose their phone number accidentally? Since there is email verification, 2FA and even KYC verification, there should be a way to change the phone number by proving that the one who request to change the phone number is the real account. It reminds me that my registered phone number in Fortunejack is not active anymore since few years ago, fortunately phone number verification is something that is not being used regularly there is no significant problem related to phone number.